Cutoff apparatus for plastic material



April 1942- I w. H. EMERSON I 2,278,513

CUT-OFF APPARATUS FOR PLASTIC MATERIAL Filed Dec. 30, '1939 5 Sheets-Sheet l WITNESSES: nwrzmon WWW BY 64.1mm

April 7, 1942,

W. H. EMERSON CUT-OFF APPARATUS FOR PLASTIC MATERIAL Filed Dec. 30, 1939 5 She'ets-Sheet 2 W] TNESSES:

M ATTORNEYS.

April 1942. w. .H. EMERSON 2,278,513

7 CUT-OFF APPARATUS FOR PLASTIC MATERIAL Filed Dec. 30, 1939 5 Sheets- Sheet 3 JZTF 9 66 7 7 L, INVENTOR; W/TNEJ 55s BY 112m 1'? W w aw. 4 QM, gg 2A id, 204 4:4 ATTORNEYS.

April 7, 1942- w. H. EMERSON 2,278,513

CUT-OFF APPARATUS FOR PLASTIC MATERI AL Filed Dec. 30, 1939 5 Sheets-Sheet 4 "'IIIIILA,

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nun/3556 INVENTOR. I BY W086i /7. W4. MW fiw v w 4 ATTORNEYS? CUT-OFFi APPARATUS FOR PLASTIC MATERIAL Filed Dec. so, 1959 5 Sheets-Sheet 5 WITNESSES INVENTOR.

4 A TTORNEYS.

Patented Apr. 7, 1942 2,278,513 CUTOFF APPARATUS FOR PLASTIC MATERIAL Walter H. Emerson,

to The Homer Lau Newell, W. Va... a corpo Application December 30,

22 Claims.

This invention relates to apparatus for periodically severing portions or blanks from a body of plastic material, and more particularly to cut-oil apparatus for pugs of clay used in making dinnerware articles and the like.

In certain types of automatic machinery, such as that used for making dinnerware, disc-like blanks of clay are placed on molds at a feeding station from which the molds are carried to another station where the blanks are shaped over the molds. It is highly desirable in the manufacture of high-grade dinnerware by these machines that the blanks be quickly and accurately centered on the molds at the feeding station, and that they be of uniform size. Heretofore, apparatus has been lacking for accurately and rapidly feeding blanks to molds, the problem being complicated by the desire to form thin blanks at the feeding station by severing them from an axially moving pug advancing continuously toward the molds.

It is among the provide apparatus for rapidly forming disc-like blanks of clay or the like and correctly positioning each one on a mold. More specific objects are to provide such apparatus which periodically severs a thin blank of uniform thickness from the end of an axially moving pug advancing continuously toward the molds at a feeding station, and which centers the blanks on the molds. A further object is to provide feeding and cutting apparatus that is substantially continuous in opis not lost between pugs.

objects of this invention to oration, whereby time The cut-off apparatus constructed in accord-' ance with this invention is most suitably used with downwardly moving pugs of plastic material, such as clay. The apparatus comprises broadly an elongate severing member, at least as long as the diameter of the pug, and means for carrying the severing member from a starting point transversely through the pug to form a disc-like blank, and then around the side of the pug back to the starting point for repeating the cycle. The severing member is carried by means supported by the tube from which the pug is elected, and may be adjustable axially of the tube for cutting blanks of greater or less thickdisposed cylindrical tube ness. In one embodiment of the invention the severing member travels first under one and then the other of a pair of tubes so that a pug in one tube can be cut as soon as the other pug is consumed. In such a case means is provided for synchronizing the cutting operation for either pug with the indexing of the molds below them.

Suitable cut-off apparatus comprises a ring termittently rotating East Liverpool, Ohio, assignor gh-lin China Company.

ration of Delaware 1939, Serial No. 311,719

surrounding the pug, and means for rotating this ring. An elongate severing member, such as a wire, is carried by the ring so-that every time the ring makes a complete revolution the severing member is carried transversely through the continuously advancing pug and cuts a disc from the lower end thereof.

The invention is illustrated in the accompanying drawings in which Fig. 1 is a sideview, partly in section, of my cut-ofi apparatus associated with a tube from which plastic material is being continuously ejected or extruded; Fig. 2 is a view taken on the line 11-11 of Fig. '1 showing the cut-off apparatus in plan disposed over a moldcarrying table; Fig. 3 is a view similar to Fig. 2 of another embodiment of the invention; Fig. 4 is an enlarged view taken on the line IV-IV of Fig. 3; Fig. 5 is a fragmentary vertical section taken on the line tical section taken on the line VIVI of Fig. 3; Fig. 7 is a view taken on the line VII-VII of Fig. 6; Fig. 8 is a view similar to Fig. 3 of a modification of the cut-ofi synchronizer; Fig. 9 is a fragmentary elevation of Fig, 8; Fig. 10 is a side view turned degrees from Fig. 9; and Fig. 11 shows the cylinder of the cut-off synchronizer in vertical section in the diagrammatically depicted fluid pressure circuit connected with the apparatus that feeds the plastic material to the cut-oil mechanism.

Referring to Fig. 1 of the drawings, a vertically l is suspended from a its lower end in close supported besuitable support 2 with proximity to a dinnerware mold it low it by a suitable mold carrier, such as an intable 3 of an automatic machine for making dinnerware and the like. The plastic material of which the dinnerware is made, generally clay, is supplied from a magazine 6 to tube 8 from the lower end of which it is extruded in the form of a compact pug l by pressure applied to the plastic material in the magazine by any suitable means (not shown). The tube is approximately coaxial with the mold when the latter is momentarily held in fixed position below it by table 4.

It is a feature of this invention that a disclike blank is periodically severed from the advancing lower end of the pug and dropped on the center of the mold. Accordingly, surrounding tube I there is a ring 8, the axis of which is disposed at one side of the tube. For supporting the ring in a plane substantially perpendicular to the tube axis,

provided with an annular groove 9 into which V--V of Fig. 3; Fig. 6 is a ver-- its inner surface is preferably Figs. 3 to 7 a pair of vertical project three wheels II, l2 and i3 that are rotatably suspended from the outer ends of three horizontal arms I8, I! and I8, respectively, proiecting laterally from a collar i3 encircling the tube and secured thereto (Fig. 2). The edges of the annular groove diverge. and the wheels are beveled so as to engage these edges and project into the groove for supporting the ring. The ring may be rotated in any convenient manner, but it is preferred to provide the outer surface of the ring with gear teeth, and to pinion 2| driven through a speed reduction unit 22 by an electric motor 23 mounted on wheelsupporting arm H. The motor may be driven intermittently in coordination with automatic positioning o1 molds beneath the p le. or it may be driven continuously in like coordination.

Connected at its upper end to collar I 9 adjacent the axis of the ring gear is an upright. arm 26, on the lower end of which a cylindrical roller 21 is Journaled on an axis coinciding with that of the ring. This roller is disposed in the socket 28 01' a block 28 that is on the roller to connect them rigidly together. The bottom of the block is provided with a depending lug 3| having an opening therethrough i'or slidably receiving a pin 22, on one end of which a nut 33 is threaded. Connected to the opposite end of this pin is the inner end of a severing or cut-oil member, preferably a wire 24, the outer end or which is connected to the lower end 01 a pin 36 projecting downwardly from ring 8. Pin 36 and arm 26 v are long enough to position the cut-ofl wire below the end of tube l where it cuts transversely through the downwardly moving pug 1 during each revolution of the ring. The wire is held taut by the nut on pin 22 and a coil spring 31.

The speed of rotation of the ring gear and the extrusion rate of the pug are so related that blanks of the desired thickness are cut from the pug. As the cut-oil wire travels in the same direction-all of the time, it always starts through the pug from the same side. Consequently, the blanks cut from the pug have parallel upper and lower surfaces even though the pug is conis soon spread out over the mold. As the cutoii! wire travels in a single plane substantially of the pug, and is carthe pug between each successive severing operation, the path of movement of the wire does not interfere with the lower end of the pug being disposed close to the mold. As a result, a blank severed from the pug has such a short distance to fall that it is certain to strike the center of themold. Furthermore, due to the fact that the blank drops flat upon the mold, instead of being cut oil! from the pug while on edge and having to topple over onto the mold, the blank can be very thin, which is obviously desirable.

In the embodiment of the invention shown in tubes and 52 are disposed with their lower ends directly above a pair of molds 52 and 54, respectively, carried by an intermittently rotating table 56 that indexes the molds from one station to another of an automatic machine. The reason for having two tubes is to eliminate the expense due to which would otherwise occur during the period required for refilling a single tube with clay after it has been emptied.

rotate it by a- With two tubes the empty tube can be refilled while blanks are being cut from the pug in the other tube,-so that blanks are fed continuously to the cut-oil apparatus.

To sever blanks from the lower ends pugs, the lower end of each tube is E'ilClfl an externally toothed ring 51 rotatably soon; by an annular bearing member 58 seen to the tube, as shown in Fig. 4. Each ring is provided in the same relative position with a vertical opening in which a vertically adjustable pin 59 is retained by a set screw or the like. The rings and pins are enclosed, and the rings are held down onv their supports, by annular housing members 6! secured to the tubes. Rotatably mounted on the lower end of each pin is a roller 62 to which one end of a cut-oil wire 63 is connected. It will thus be seen that when the two rings are rotated in unison in the same direction, the cut-off wire will be carried by them in a horizontal plane below first one tube and then the other. To keep the wire taut and to compensate for backlash in the drive, one end of the wire is connected to its roller by means of a coil spring 84.

, The two rings are driven from the main drive of the machine through a gear box 66 connected to both tubes as shown in Figs. 3 and 6. This box contains a pinion 61 that meshes with the rings, and a gear 68 that drives the pinion. The gear is rotatably mounted on a vertical drive shaft 89 that extends upwardly from the main drive of the machine, and is normally rotated by the drive shaft through means about to be described in order to rotate the two rings.

It will be seen that if the cut-oil wire passed under tube 5| while a mold was held stationary under that particular tube by the indexing table 56, the table would be moving the mold to the next station (under tube 62) during the time that the cut-ofl, wire was passing from tube 5| around under the other tube and back to tube 5|. In other words, as the wire passed under tube 52 the table would be moving instead of stationary. Consequently, if the first tube were exhausted and it was desired to feed clay from the second tube, blanks would be cut therefrom while the molds were in motion.

To avoid such a condition means is provided either tube, as desired, with the indexing of the Accordingly, the rate of travel of the cut-ofl wire is changed momentarily at the time the cutting from one tube to the other in order to change the position to the table while the latter it will cut the new pug only when a mold is stationary below it. Preferably, this is accomplished by stopping the cut-oil wire for a period of time equal to the time required for the wire to make a half cycle, so that the wire will pass through the new pug while the table is stationary. For this purpose gear 58 is provided with half .and a flanged member travels on a "i3 by its collar.

. 82 of Fig.

of by hand wheel 83. This is done by fluid pres sure'operatedmeans the fluid pressure cylinders that force the clay .piston are a pair of by a cross bar the shaft between a collar 18 secured to the sleeve ll at the upper end of the shaft. Loosely mounted on the sleeve below its collar is a. ring ll that is suspended by links 19 from a disc M carried by box. Rigidly mounted on the cation. only one of the cylinders I09 and mi 51s 3 hausted from their front ends through pipes H1. The outlet ends of the magazines are connected suitable tubular conduits (not shown) to tubes (Fig. 8), whereby clay forced out of the magazines by the plungers is extruded from the lower ends of the tubes. As shown in the above-mentioned Emerson and Denison appli- 5! and 52 time to extrude clay from its assoand pilot valve I86 shifts the operates at a ciated magazine.

operation from that cylinder to the other as soon lower ring it is raised and in turn lifts sleeve passing over the stationary lug below it, sleeve lug i2 is pulled out of engagement lug ll temporarily, and the sleeve therefore rotates with the drive shaft without rotating gear E8 until the sleeve lug, moved downwardly again by spring it, has made a full revolution and again engages the gear lug.

' Figs. 8 to 11 illustrate a way in which pin 6 can be raised automatically instead connected in circuit with from the lower'ends of tubes at and 52 so that the cut-oil wire will be automatically synchro- Y nized with the tube from which the clay is being extruded.

. A plate 9! is mounted on top of gear box as and extends inwardly toward tubes 5i and 52 While the'hand wheel lug is Y with gear in order to support a small fluid pressure cylinder 92 in which a piston zontally. Connected-to the opposite sides of the piston rods 9; that extend through the ends of the cylinder. The outer ends ofthe rods carry laterally extending arms 96 the outer ends or which are connected together Si that is slidablysupported on a block 98 (Fig. 10) mounted on top of plate Si. The central portion is adapted to engage and raise a roller lfltrotata'bly supported by a bracket I02 secured to of this cross bar is provided $3 is reciprocable horithe upper end oipin 82 which extends upwardly through the plate and block.

When piston Stis moved fromione end to the other of the cylinder the lug ,on cross bar ti engages roller HM and thereby raises the bracket and pin 82 while it passes under the roller. To permit pin 82 to be raised manually when desired, bracket I02 is provided with a laterally extending pin M3.

. As shown in Fig. 11' the opposite ends of the interior of cylinder 92 are connected by tubes 15 to a source of fluid under pressure.

connection is preferably made through a pilot valve I06, such as shown in the copending application of Walter H. Emerson and William Denison, Serial No. 323,166, filed March 9, 1940, with a pipe Nil to which the pressure fluid is supplied. This pilot valve controls, through pipes (not shown) that admit fluid under pressure "posite ends of cylinders I09 and H0 in which are disposed pistons Hi that force plungers H2 through tubular magazines H3 and III that are fllled with clay. The fluid is supplied to the rear ends of the cylinders through pipes H5, and ex- 7 sizes may thus .cut verythin so that it wardly as shown in Fig.

as the clay from the first magazine has been exhausted. The pilot valve is operated automatically for this purpose by the increase in fluid pressure that occurs behind one of the pistons Ill when that piston reaches the forward limit of its stroke. I This increased pressure acts through the associated pipe H6 and a branch pipe M8 to open a check valve H9 connected to one of the pipes m8 and the pilot valve. An increase in pressure in either end of the pilot valve trips it, and when it is in either one oi-its two positions fluid under pressure from pipe i0! is connected by the pilot valve with one of the tubes its leading to cylinder 92, and the other tubeis connected through a pipe MD with a tank or the like (not shown) It will thus be seen that as soon as piston Iii reaches the forward limit of its stroke in cylinder lib, which means that the clay from magazine ili has sure behind that piston builds up until it trips pilot valve W6 which in turn causes piston 83 to move to the opposite end of cylinder 92 and thereby synchronize the operation of the cut-ofi wire with indexing of molds under the clay col-- umn that starts to be fed to the machine by cylinder N39 to the rear end of which fluid under pressure was admitted when the pilot valve was tripped.

It will berealized a pug the portion of the blank that is first severed from thepug bends downwardly into contact with the mold. In doing this it swings in- 5. Therefore, if the end of the pug isconcentric mold, the blank will not be exactly centered on the mold. To prevent this from happening I offset the axis of the pug relative to the axis of the mold in the direction from which the cut is ably accomplished by providing the tube with a nozzle B25 that may be adjusted laterally in any axis of the lower with the axis of the direction an amount suflicient to assure centering of a blank on an underlying mold. The nozzle is detachably clamped against the bottomof bearing member 58 by a clamping ring I26. Nozzles of various dianietersfor blanks of different be interchangeably connected to the clay tube. Fig. 5 shows the axes of the tube and mold concentric, and the concentric axes of the nozzle and the emerging portion of the pug oifset relative to the mold axis in the direction from which the cut is started.

It should be particularly noted that withthe apparatus disclosed in this application clay blanks can be cut which are substantially the same diameter as the molds. This is because they can be is not necessary to press thinner on the molds and thereto increase in diameter. The be cut so thin is them out much by cause them reason that the blanks can that they are cut above and close to the molds so that they drop substantially flat on the molds. Heretofore, where blanks were cut from the end been exhausted, the fluid presthat as the wire cuts through started. This is preferof a horizontal thick,

- best embodiment.

of adjacent tubes from pug they had to be thick enough tobe self-supporting so that they would fall through an are around their lower edge and not fold up 1 fore they struck the molds. Being they had to be pressed out thin on the molds. and therefore the blanks were made considerably smaller than the molds to allow for their increase in diameter when pressed thin.

By feeding clay from tubes ii and I2 simultaneously and cutting blanks from both clay columns at once, such as by simultaneously-operating independent cut-oil means of the type shown in Fig, 1, two blanks of clay can be supplied to the same mold. Thus, by using a smaller clay nozzle and a clay of different color with the first tube than with the second, the larger blank can be superimposed on the smaller on the same mold to produce a plate having a center and border of diflerent colors.

According to theprovisions of the patent statutes, I have explained the principle and mode of operation of my invention, and have illustrat-.

what I now consider to be its However, I desire to have it understood that, within the scope of the appended claims, the invention may 'be practiced otherwise than as specifically illustrated and described.

I claim:

1. Apparatus for cutting blanks from the end of a pug of plastic material, comprising a substantially vertical tube from the lower end of which said plastic material is ejected, a ring surrounding the tube, means connected to the tube and rotatably supporting the ring, a pin projecting downwardly from the ring to a point wire connected at one end to the lower end of the pin, means disposed at the side of'the tube and projecting downwardly below it for movably of the wire, whereby said ring carries the wire beneath the tube for periodically severing a disc from the plug.

2. Apparatus for cutting blanks of substantially uniform thickness from the end of a pug of plastic material, comprising a substantially vertical tube from the lower end of which said plastic material is continuously extruded, a ring gear encircling the tube with its axis at one side thereof and provided in its inner surface with an annular groove, a plurality of horizontal wheels spaced laterally from said tube and registering with said groove for rotatably supporting the ring gear, supporting ed and described tube, a rotatable support connected to the tube adjacent the axis of the ring gear, a cut-oil wire connected at its ends to said pin and rotatable support, a pinion meshing with the ring gear, and means for driving the pinion.

3. Apparatus for cutting blanks from the ends of pugs of plastic material, comprising a pair the lower ends of which said plastic material is adapted to be elected, a ring encircling each tube, means connected to the tubes for rotatably supporting the rings, a cut-off one tube and then the other.

4. Apparatus for cutting blanks from the ends of pugs of plastic material, comprising a pair of adjacent tubes from the lower ends of which said plastic material is adapted to be ejected, a

supporting .the opposite end ring encircling each tube, means connected to the tubes for rotatabiy supporting the rings, a pin projecting downwardly from each ring to a point below the tubes, a cut-oi! wire connected at its ends to the lower ends of the pins, and means for rotating the rings to carry said wire beneath first one tube and then the other.

5. Apparatus for cutting blanks from the ends of pugs of plastic material, comprising a pair of adjacent tubes from the lower ends of which said plastic material is adapted to be ejected, a ring tube, means connected to the tubes for rotatably supporting the rings, a pin projecting downwardly from each ring to a point below the tubes, a roller rotatably mounted on the lower end 01' each pin, a cut-oil wire connected at its ends to said rollers, and means for rotating the rings to carry said wire beneath first one tube and then the other.

6. Apparatus for cutting blanks from the ends of pugs of plastic material, comprising a pair of projecting downwardly from each ring to a point below the tubes, a cut ofl wire connected at one Dug.

8. The combination with a vertical tube for feeding a pug of plastic material downwardly, a substantially horizontal cut-oil wire, and means for moving the wire laterally through the projectstantially horizontal cut-oil wire, means for carrying the wire beneath first one tube and then the other to sever a blank from. a pug of plastic material in one tube in synchronism with said' indexing means, and means for arresting said wire-carrying means during 'a portion of its cycle of operation to synchronize the cutting of blanks from a pug in the other tube with said indexing means.

11. The combination with mold-indexing means provided with a plurality of stations, of a pair of tubes disposed with their lower ends above a pair of adjacentstations of said means, a substantially horizontal cut-oil wire, means for carrying the wire beneath first one tube and then the other to sever a blank from a pug of plastic ma-' terial in one tube in synchronism with said indexing means, continuously operating means for actuating said wire-carrying means, and means for momentarily disconnecting the wire-carrying means from its actuating means to synchronize the cutting of blanks from a pug in the other tube with said indexing means.

12. The combination with mold-indexing means provided with a plurality of stations, of a pair of tubes disposed with their lower ends above apair of adjacent stations of said means, a ring encircling each tube, a cut-ofi wire disposed below the tubes and connected at its ends to both rings, means for rotating the rings to carry the wire below first one tube and then the other, and

means for disconnecting said rings from their rotating means for a predetermined interval.

13. The combination with mold-indexing means provided with a plurality of stations, of a pair of tubes disposed with their lower ends above a pair of adjacent stations of said mea a ring encircling each tube, a cut-off wire disposed below the tubes and connected at its ends to both rings, driving means, and means including cooperating detents connecting said driving means to said rings, said detents being biased into operative engagement, and means for disengaging said detents for a predetermined interval.

14. The combination with mold-indexing means provided with a plurality of stations, of a pair of tubes disposed with their lower ends above a pair of adjacent stations of said means, a ring encircling each tube, a cut-off wire disposed below the tubes and connected at its end to both rings,

a drive shaft, a driven member rotatably mounted on said shaft and operatively connected to said rings for rotating them, a driving member splined on said shaft,-said driving and driven members being provided with interengaging detents whereby the former drives the latter. and means for moving said driving member.axially of the shaft to temporarily disengage said detents.

15. The combination with a vertical tube for feeding a pug of plastic material downwardly, a substantially horizontal cut-oil wire, and means for moving the wire laterally through the projecting end of the pug to cut a disc therefrom and deposit it on a mold below, of a nozzle connected to the lower end of the tube and through which the pug is ejected, said nozzle being adjustable radially relative to the tube whereby said disc may be centered on the mold.

'16. The combination with mold-indexing means provided with a plurality of stations, of a pair of tubes disposed with their lower ends above a pair of adjacent stations of said means. a substantially horizontal cut-off wire, means for carrying the wire beneath first one tube and then the other to sever a blank from a pug of plastic material in one tube in synchronism with said indexing means, and'fiuid pressure controlled means for momentarily, changing the rateof operation of said wire-carrying means to synchronize the cutting of blanksfrom a pug in the other tube with said indexing means.

17. The combination with mold-indexing means provided with a plurality of stations, of a pair of tubes disposed with theirlower ends above a pair of adjacent stations of said means, a ring encircling each tu e, a cut-off wire disposed below the tubes and nnected at its ends to both rings, driving means, and means including cooperating detents connecting said driving means to said rings, said detents being biased into operative engagement, and fluid pressure operated means for disengaging said detents for a predetermined interval.

18. The combination with mold-indexing means provided with a plurality of stations, of apair of tubes disposed with their lower ends above a pair of adjacent stations of said means, a ring encircling each tube, a cut-off wire disposed below the tubes and-connected at its end to both rings, a drive shaft, a driven member rotatably mounted on said shaft and operatively connected to said rings for rotating them, a driving member splined on said shaft, said driving and driven members being provided with interengaging detents whereby the former drives the latter, a reciprocable member for moving'said driving member axially of the shaft to temporarily disengage said detents, a piston for reciprocating said member, and a fluid pressure cylinder housing the piston.

- 19. The combination with mold-indexing means provided with a plurality of stations, of a pair of tubes disposed with their lower ends above a pair of adjacent stations of said means, a pair of plungers for extruding a pug of plastic material from the lower end of first one tube and then the other, a substantially horizontal cut-off wire, means for carrying the wire beneath first one tube and then the other to sever a blank from the pug from one tubein synchronism with said indexing means, and means actuated when the plunger that is extruding plastic material from said last-mentioned tube reaches the forward limit of its stroke for momentarily changing the speed of travel of said wire-carrying means to synchronize the cutting of blanks from a pu from the other tube with said indexing means. v

20. The combination with mold-indexing means provided with a plurality of stations, of a pair of tubes disposed with their lower ends above a pair of adjacent stations of said means, a pair of plungers for extruding a pug of plastic material from the lower end of first one tube and then the other, fluid pressure operated means for moving the plungers forward alternately independently of each other,'a substantially horizontal cut-off wire, means for carrying the wire beneath first one tube and then the other to sever a blank from the pug from one tube in synchronism with said indexing means. and means actuated bya momentary increase in said fluid pressure caused by the plunger that isextruding plastic material from said lastmentioned tube reaching the forward limit of its stroke for momentarily changing the speed of travel of said wire-carrying means to synchronize the cutting of blanks from a pug from the other tube with said indexing means.

21. The combination with mold-indexing means provided with a plurality of stations, of a pair of tubes disposed with their lower ends above a pair of adjacent stations of said means,

a pair or plunzers tor extruding a pus of plastic ma from the lower end or first one tube and ,then the other, fiuid pressure operated means for moving the piunsers forward alternately independently or each other, a substantially horizontal cut-oi! wire. mean for carry-- in; the wire beneath first one tube and then the other to sever a blank from the pug from one tube in synchronism with said indexing means, means for momenta ily changing the speed of sure cylinder housing the piston, and means necting said cylinder with said fiuid pressure.

both rings, and means for rotating the rings for ca ying said wire beneath first one tube and then the other.

WALTER H. EMERSON.

con- 

